Wow, I just heard a gunshot

I'd like to think it was a firecracker, but it didn't sound like one. It isn't near midnight, either, and I have never heard gunshots to celebrate the NY, although I know it could happen. This happened in conjunction with my ace guard dog maltipoo, Spike, barking at the patio door. But, this gunshot was not in my yard. Somewhere else...what goes up, must come down. Don't do it!